Where the video actually goes
Realtime media runs on its own host with its own relay infrastructure, deliberately separate from the application tier. A video relay is a machine whose whole job is to accept connections from strangers on the internet, which is exactly the profile you do not want on the same box as the patient record.
So the media host carries no patient data. It moves packets between two parties who have already been authenticated somewhere else. Compromising it gets you a busy relay and nothing to read.